The Gates's Mansion is a large mansion that overlooks Lake Washington in Medina, Washington, United States. The 66,000-square-foot (6,100 m2) mansion is noted for its design and the technology it incorporates. It is nicknamed Xanadu 2.0 after the title character's estate in Citizen Kane. It took seven years to build and cost $63.2 million. In the late 1990s and early 2000s, interns at Microsoft attended annual summer parties at the house.
In 2009, property taxes were reported to be US $1.063 million on a total assessed value of US$147.5 million.
The house was the result of a collaboration between Bohlin Cywinski Jackson Architects (based in Pennsylvania but with satellite offices in Seattle and San Francisco) and Cutler-Anderson Architects of Bainbridge Island, Washington. Neither company's website currently has information or images of the house, perhaps due to Gates's privacy and security concerns.
The mansion is a modern design in the Pacific Lodge style, with classic features such as a private library with a dome shaped roof and oculus. The house also features an estate-wide server system, a 60-foot (18 m) swimming pool with an underwater music system, a 2,500-square-foot (230 m2) gym, a 1,000-square-foot (93 m2) dining room, and heated floors and driveways. Guests wear pins that automatically adjust temperature, music, and lighting based on their preferences upon entering a room. It is also an earth-sheltered house.